@book { DieBundeslnderinderEuropischenUnion,
    title = "Die Bundesländer in der Europäischen Union",
    author = "Hans-Peter {Donoth}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1083092"
}